Here is my workaround to force HDMI reconnect that i use for some time now on all my devices RPi4, RPi5, Vero 4k+, Intel N100
For this to work you need System -> Player -> Videos -> adjust display refresh rate -> On Start (or Start/stop should work too)
SSH to you device
Code
wget https://sky42.libreelec.tv/testing/hdmi-switch.tar.gz
tar -xvf hdmi-switch.tar.gz
# try e.g.
hdmi-switch/bin/switch-23-50-60.sh
If you now put that on a button on your remote you can fix this pretty fast every time you need. As example for a BT Keyboard long press F5 as config in a keyboard.xml.